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1 Core network aspects

7.7 Proactive video caching

This service scenario involves passengers on moving vehicles (train, car, bus, etc.) who watch video content
over the Internet with their portable devices (smartphone, laptop, etc.). In the case of a moving train, the
video content being watched is proactively cached at every DAN element in each station according to the
scheduler that decides how much video content should be proactively cached based on video and
transportation information. In the case of other means of transport whose moving direction is not
predetermined, location information from the navigation system can be used to choose the DAN element
where the video content is cached proactively.
Figure 7-13 depicts a sample scenario for proactive video caching.

Figure 7-13 – Proactive video caching

The operational procedures of the scenario are as follows:
1) An end user in a train requests a cinema film, i.e., an NDO, from its service provider.
2) The end user begins watching the film.

3) The service provider pushes the segments of the film file to the DAN nodes in the stations that the
train will pass through.
4) As the train passes through stations, the end user is able to access and retrieve the segments that
will be watched next.

Figure 7-14 is a procedural diagram of DAN functions for this scenario.

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